SmogRank / History / City race
Cities in Hong Kong, worst air first, day by day
Each measured city's average over the 30 days to every day since January 2023, worst first. Find your own city to follow it through the race, or keep to one country.
The worst cities in Hong Kong for PM2.5 over the 30 days to 16 Jul 2025: Wan Chai 15.6 µg/m³, Fanling 9.1 µg/m³ and Mong Kok 8.2 µg/m³.
- 1Wan ChaiWan Chai15.6
- 2FanlingNorth District9.1
- 3Mong KokYau Tsim Mong District8.2
- 4Kwai ChungKwai Tsing District8.2
- 5Tuen MunTuen Mun8.1
- 6Sham Shui PoSham Shui Po District7.7
- 7Tin Shui WaiYuen Long7.4
- 8Sau Mau PingKwun Tong District7.4
- 9Tai PoTai Po7.2
- 10San Tung Chung HangIslands7.2
- 11Tsuen WanTsuen Wan7.0
- 12Sha TinSha Tin6.0
- 13VictoriaCentral and Western4.6
Cities counted each day
A city's number is its average over the 30 days, shown only when 21 of them were measured (5 of 7 on the 7-day race), the same minimum as the 30- and 7-day boards. A city whose monitors go quiet fades out where it stood rather than sliding down, so a gap never reads as cleaner air. Some large countries are thin or missing because their monitors' licences don't allow reuse. How we rank.
Not covered: the government monitoring networks of China and Turkey, which publish only on their own websites; we are building the readers for them. Most cities there are missing from this board, not clean. Why.